In contrast to its chemical isomer Nomex®, the tensile properties of Polyaramid Polyparaphenylene Terephthalamide ( Kevlar / Twaron ) are up to an order of magnitude greater than those of normal textile fibres, because of a high degree of molecular orientation resulting from its stiff linear molecules and their propensity for forming liquid crystals in the spinning solution.

Applications

Polyaramid Polyparaphenylene Terephthalamide ( Kevlar / Twaron ) fibres are quite widely used in composites which are lighter than those based on carbon fibre and electrically insulating. Their mechanical properties are generally inferior; more specifically they have a high specific tensile strength approaching that of carbon fibre composites, but quite low strength in compression.

Leachables are trace amounts of chemicals originating from packaging, containers, medical devices or process equipment that end up as contaminants in medicinal products or food resulting in exposure to patients or consumers.

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